controller-manager配置

[root@dev-istio-master-001 ~]# cat /etc/kubernetes/manifests/kube-controller-manager.yaml 
apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    component: kube-controller-manager
    tier: control-plane
  name: kube-controller-manager
  namespace: kube-system
spec:
  containers:
  - command:
    - kube-controller-manager
    - --allocate-node-cidrs=true
    - --authentication-kubeconfig=/etc/kubernetes/controller-manager.conf
    - --authorization-kubeconfig=/etc/kubernetes/controller-manager.conf
    - --bind-address=127.0.0.1
    - --client-ca-file=/etc/kubernetes/pki/ca.crt
    - --cluster-cidr=10.244.0.0/16
    - --cluster-signing-cert-file=/etc/kubernetes/pki/ca.crt
    - --cluster-signing-key-file=/etc/kubernetes/pki/ca.key
    - --controllers=*,bootstrapsigner,tokencleaner
    - --kubeconfig=/etc/kubernetes/controller-manager.conf
    - --leader-elect=true
    - --node-cidr-mask-size=24
    - --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.crt
    - --root-ca-file=/etc/kubernetes/pki/ca.crt
    - --service-account-private-key-file=/etc/kubernetes/pki/sa.key
    - --use-service-account-credentials=true
    image: k8s.gcr.io/kube-controller-manager:v1.14.0
    imagePullPolicy: IfNotPresent
    livenessProbe:
      failureThreshold: 8
      httpGet:
        host: 127.0.0.1
        path: /healthz
        port: 10252
        scheme: HTTP
      initialDelaySeconds: 15
      timeoutSeconds: 15
    name: kube-controller-manager
    resources:
      requests:
        cpu: 200m
    volumeMounts:
    - mountPath: /etc/ssl/certs
      name: ca-certs
      readOnly: true
    - mountPath: /etc/pki
      name: etc-pki
      readOnly: true
    - mountPath: /usr/libexec/kubernetes/kubelet-plugins/volume/exec
      name: flexvolume-dir
    - mountPath: /etc/kubernetes/pki
      name: k8s-certs
      readOnly: true
    - mountPath: /etc/kubernetes/controller-manager.conf
      name: kubeconfig
      readOnly: true
  hostNetwork: true
  priorityClassName: system-cluster-critical
  volumes:
  - hostPath:
      path: /etc/ssl/certs
      type: DirectoryOrCreate
    name: ca-certs
  - hostPath:
      path: /etc/pki
      type: DirectoryOrCreate
    name: etc-pki
  - hostPath:
      path: /usr/libexec/kubernetes/kubelet-plugins/volume/exec
      type: DirectoryOrCreate
    name: flexvolume-dir
  - hostPath:
      path: /etc/kubernetes/pki
      type: DirectoryOrCreate
    name: k8s-certs
  - hostPath:
      path: /etc/kubernetes/controller-manager.conf
      type: FileOrCreate
    name: kubeconfig
status: {}

其中：

• --allocate-node-cidrs=true：启用Pod的CIDR，这个参数有什么用？
• --cluster-cidr：Pod的cidr掩码，启用--allocate-node-cidrs才会生效；
• --node-cidr-mask-size：集群节点CIDR掩码，默认24；
• --authentication-kubeconfig和--authorization-kubeconfig：kube-controller-manager使用它连接apiserver，对client的请求进行认证和授权。kube-controller-manager不再使用--tls-ca-file对请求https metrics的Client证书进行校验。如果没有配置这两个kubeconfig参数，则client连接kube-controller-manager https端口的请求会被拒绝(提示权限不足);
• --bind-address：监听该ip地址10252端口的https metrics请求；
• `--controllers=*,bootstrapsigner,tokencleaner
• --kubeconfig：指定kubeconfig文件路径，kube-controller-manager使用它连接和验证kube-apiserver；
• --leader-elect=true：集群运行模式，启用选举功能；被选为leader的节点负责处理工作，其它节点为阻塞状态；
• --use-service-account-credentials=true：kube-controller-manager中各controller使用serviceaccount访问kube-apiserver。

参考文档

• https://kubernetes.io/docs/reference/command-line-tools-reference/kube-controller-manager/